What’s Vulnerable › Vulnerabilities

CVE-2026-92154: F´: File size bounds bypass in Svc::FileUplink via unsigned integer overflow in DATA packet validation

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-15
• Weakness: CWE-190

Description

F´ (F Prime) is a framework that enables development and deployment of spaceflight and other embedded software applications. Prior to 4.2.0, Svc::FileUplink handleDataPacket offset and size validation is vulnerable because the component checks byteOffset plus dataSize with wrapping U32 arithmetic and then seeks to the large attacker-controlled offset before writing. When a file-uplink DATA packet supplies a byteOffset and dataSize whose unsigned sum wraps below the declared file size, data can be written beyond the declared upload size, causing file integrity loss and potentially large sparse-file growth or resource exhaustion. This issue is fixed in version 4.2.0.

Affected products

• nasa fprime: before 4.2.0

References

• https://github.com/nasa/fprime/commit/cacdd555456bd83ab395b521d56c0330470ea798
• https://github.com/nasa/fprime/pull/4919
• https://github.com/nasa/fprime/security/advisories/GHSA-wx8q-q5gx-f54p
• https://github.com/nasa/fprime/security/advisories/GHSA-wx8q-q5gx-f54p

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